function chk_payment()
{
    
    var x = document.selectPayment;
    var chk_checked = false;
	 
    for(i = 0; i < x.payment.length; i++)
	{
	    if(x.payment[i].checked)
		{
		   chk_checked = true;
		   break;
		 }  
	}
	
	if(!chk_checked)
	{
	    alert("Select Payment Mode");
		return false;
	}
	
	return true;
}